Rocker arm I - inlet right, exhaust left

For inlet on right side or exhaust on left side.

The R25/3 rocker arm originally had a different part number because it was supplied with a bronze bushing pressed in (press fit).

This system was abandoned with the R26: the R25/3 can now also be fitted with a separate bearing bushing, like its predecessor, the R25/2, and its successor, the R26.